Egbert edwards and adam lung-en



. UNITED STATES y, PATENT O FICE.

ROBERT EDWARDS AND ADAM LUNGEN, on NEW YORK, N..- Y.

ELECTRIC BELL.

SPECIFICATION forming part of Letters Patent No. 240,582, dated April 26 188 Application filed July 19,1880. (Model) To all whom it may concern Be it known that we, ROBERT EDWARDS and ADAM LI'iNGEN, both of New York city, haveinvented certain new and useful Improvements in'Electric Bells, of which the following is aspecification.

The chief objects of our invention are to protect the mechanism of the bell from exposure or derangement by access of dust, moisture, or; other extraneous matter, as also to enable the adjustments of the parts to be made with more convenience. v To these ends the main features of ourinvention consist in providing the'mechanism with a completely inclosing case, having :no apertures or crevices to admit extraneousmat ter, and also in having the adjusting-screws arranged upon the exterior of the caseiand ex-J' tended tightly through the same, whereby all adjustments may be made from the exterior without requiring the opening of the case 0 the removal of any parts thereof. i

Our invention also consists in the form of the armature-spring and ofthe adjustingscrews, and in other minor features, ash'ereinafter fully set forth. l r

In the annexed drawings, Figure 1 gives an external 'front elevation bell inclosing the mechanism thereof, the bell being removed. Fig. 2is a similar view with thefront plate of the case removed, exposing the mechanism and showing some parts in section. Fig. 3 is a side elevation, partly in section, with the bell attached.

The mechanism for vibratingthe hammer of the bell and thus sounding the alarm is, as

maybe observed, of the usual type-that is,;

an elec'tro-magnet, a, and a rockingarmature, b, to the rock-shaft of which is hammer c d, the current through the magnetbeing established throughithe armature and astopsorew, e, against which it retires by a spring, f, so that the spring constantly tends to retract thearmature and close the circuit, while the magnet, in turn, attracts the armature and breaks the circuit, thus producing aconstant vibration in the usual manner. Theadjustingscrew eserves to regulate the length of the arm atures vibration, and'the adjusting-screw gregulates the tension of its spring f, as will be readily understood.

In bells of this class heretofore the adjustparts of the armature inclosed within it. .thermore, the rock-shaft or axis h of the armaof the casing of the attached the,

in g devices have been placed within the case,

so that a removal of part of the case is necessary to get access thereto 5 and, moreover, the

rock-shaft of the armature and of the bellhammer have also been placed Wholly within the case,while the hammerhasvibrated through an open slot therein, which, of course, admits the entrance of extraneous matter, which frequentl y deranges the actionof the mechanism.

In our invention the adjusting-screws e g, which regulate the tension and stroke of the armature, are placed upon the exterior of the casey, with their stems working tightly through and into the case, to bear upon the appropriate ture is' pivoted at its remote end in the base of the case, while its opposite or near end extends outof the case through a tight but free-fitting opening in an attached lug, w, on the side of thecase, and the arm 0 of the bell-hammer is attached to the rock-shaft on its exterior or projecting end, and not to the portion within the case, as heretofore. Finally, the front or opening of the case is covered by a clo'sefitting plate, screwed to the case at suitable points, as indicated at It, and so formed as to completely cover the opening, and thus entirely inclos'e the mechanism. The joint of the plate with the case may be sealed similar cement, if desired, to ure practically hermetical. It may therefore be'readily observed that by this inclosure of the mechanism and the arrangement of the adj Listing-screws and bell-hammer upon the exterior of the case the adjustments are more readily made, as no part of the case is removed therefor; and, furthermore, all openings or orevices which would admit dust, wet, or insects are entirely obviated, thus preventing any dog .ging of the mechanism or any interference with the internal conduction orinsulation, which has been a source of frequent derangement informer constructions.

with red lead or make the inclos- The form of the mechanism case y is prefer-.1

ably circular, as illustrated; but this is not es sential, and it is preferably made of cast-iron, being cast in one piece, as shown, its; base having lugs l Z, by which the whole device is fixed in position. The top plate,i, is formed with a projecting post, an, to which the belln isattached, and the arm of the bell-hammer is ating-sleeves by the short nuts 'I' r,-screwed on either end thereof, so that the adj usting-screws turn in the hollow screws, as in a nut, and are held firmly at the desired adjustment by the jam-nuts s s, which screw against the ends of the hollow screws 0 o, as shown. Now, the circuit-wires connect also on the exterior of the case to the hollow screws 0 0, being preferably clamped between the insulatingsleeves and the nuts 1" r, as shown. It may be observed, however, that the tip of the tension-screw is provided with insulating material, t, where it contacts with the tension-sprin g f, while the contact-screw 6 makes metallic connection with the contact-spring u. The tension-screw is thus out of the direct path of the current, while the contact-screw is always in this path, the current being completed through the same. The current, therefore, enters, say, through the nut of the tension-screw, passes thence to one end of the magnet-coils, and from the opposite end of the magnet-coils flows to the tension-spring f, and thence, through the armature or its contact-spring u, tothe contact-screw e, and off by the negative circuitwire, which connects to its nut a". By this arrangement of parts it will be observed that the electrical connections to the magnet are made on the exterior of the case, through the projecting adjusting-screws or their nuts, which is a simple, convenient, and effective method. The tension and contact springs f u are formed of one piece of metal, preferably spring sheetbrass, bent at about right angles, curved around the rock-shaft h, fastened to the armature at '0, with one end projecting toward the tension-screw to form the tension-spring and the other end extending in front of the contact-screw to form the contact-sprin g, this construction being obviously both simple and cheap, as well as effective.

It may be further observed from Fig. 2 that the tension-spring extends tangentially from the axis of the armature and at right angles to the armature. This form and position of the spring gives the armature great leverage over it, and the flexure of the spring is partly a winding and partly a bowing action, and its movementis found to be "cry quick and elastic, its flex being easy on the magnet and its reflex strong on the armature and hammer, so that a much weaker battery than usual is sufficient to produce an energetic vibration of the hammer.

It may be observed from Fig. 2 that the armature 12 does not extend centrally from the axis or rock-shaft h, but projects tangentially therefrom, and is fastened to the side thereof. This detail has the advantage of being more simple and convenient, and also brings the armature into close range with the magnet.

What we claim as our invention is- 1. An electric bell or alarm constructed with a case completely inclosing the ringing mechanism without opening or crevice, and having the bell placed exteriorly to the case, and an operating portion of the striking device working through said case in a tight-fitting manner, substantially as and for the purpose set forth.

2. The combination, in an electric alarm, of a case completely inclosing the ringing mechanism without unclosed opening or crevice, a bell mounted exterior to said case, with a rocking shaft operated by said ringing mechanism within the case, but having its outer end extended through aclose-fittin g bore in said case, and a bell-hammer attached. to the projecting end of said rock-shaft on the exterior of the case, substantially as herein shown and described.

3. The combination, with an electric bell, of a case tightly inclosing the ringing mechanism thereof, and armature-adjusting screws mounted on the exterior of the case, with their stems screwing through tight-fitting nuts or tapped holes in the wall of the case, and into the interior thereof against the appropriate parts of the armature, with circuit-wires connecting exteriorly to said screws, substantially as and for the purpose set forth.

4:. The combination, with the rocking armature b, of the tension and contact spring f a, formed of one piece of metal bent at right angles, or nearly so, and fastened at the bend to the armature, at or near the axis thereof, substantially as herein shown and described.

5. The combination, with an electric bell, of a case inclosing the ringing mechanism thereof, armature-adjusting screws mounted on the exterior ofthe said case and passing through insulating-sleeves thereinto, with circuit-wires connecting exteriorly with said screws or the nuts thereof, and internal connections from said screws or their nuts, with the magnet and armature of the inclosed ringing mechanism, substantially as and for the purpose herein shown and described.

6. In an electric bell in which the circuitwires connect to the adjusting-screws of the rim ging-armature, the tension-screw g, having an insulating-tip contacting with the tensionspring, substantially asand for the purpose set forth.

7. An electric bellor alarm constructed with a case permanently and completely inclosing the ringing mechanism without opening, and having the heads of the adjusting-screws and bell placed exterior to the case, and the operatin g portion of the hammer working through a tight-fitting aperture in said case, substantially as described, and for the purpose set forth.

8. The combination, with the mechanism of an electric bell, of the inclosing-case y, formed in one imperforate piece, top plate, i, formed with the post m, and bell n, attached to said post, substantially as herein shown and described.

9. In an electric bell or alarm, the combination, with theimperforate case 3 formed in one piece, and inclosing the ringing mechanism, and its closingtop piece. or cover, i, provided with the i post m, carrying the bell it, both post and bell lying outside of said case, of the rock-shaft h, jourualed in the base of the case and projecting beyond the outer face of the cover, lug w, secured to the case, and provided with an opening forming a journal-bearing for the rockshaft, and bell-hammer 001, secured to the outer projecting end of the rock-shaft, substantially as described, and for the purpose specified.

ROBERT EDWARDS. ADAM LUNGEN.

Witnesses:

CHAS. L. RoEDER, E. BERGMANN. 

